State Route 100 (SR100) is a state highway in the U.S. state of Maine, running from Portland to Bangor.

The south end of SR100 is at the intersection of Forest Avenue and Cumberland Avenue in downtown Portland. Its north end is at the intersection of Hammond Street, Main Street, State Street and Central Street in downtown Bangor; SR100 runs along Hammond Street with U.S. Route 2 (US2) which continues across Main Street/Central Street onto State Street.

The majority of SR 100 is concurrent with other routes: US302 from downtown Portland to northern Portland, SR26 from northern Portland to Gray, US202 from Gray to Augusta, US201 from Augusta to Fairfield, SR11 from Fairfield to Newport, and US2 from Newport to downtown Bangor. The only parts of SR100 that do not run along another route are in Portland, first (as Forest Avenue) between its southern terminus and the Interstate 295/US1 interchange (where US 302 begins) and between US302 and SR26 where it is alone on a small piece of Allen Avenue.

Major junctions

CountyLocationmikmDestinationsNotes
CumberlandPortland0.000.00Cumberland Avenue / Forest Avenue
0.39– 0.600.63– 0.97I-295/ US1/ US302 begins– Falmouth, South PortlandExit 6 on I-295; southern end of US 302 concurrency
1.452.33SR9 west (Woodford Street)/ Deering AvenueSouthern end of SR 9 concurrency
1.542.48SR9 east (Ocean Avenue)/ Saunders StreetNorthern end of SR 9 concurrency
2.794.49US302 west (Forest Avenue)– WestbrookNorthern end of US 302 concurrency
3.625.83SR26 south (Washington Avenue)/ Allen Avenue– FalmouthSouthern end of SR 26 concurrency
Falmouth5.95– 6.009.58– 9.66I-95/ Maine TurnpikeKittery, Boston, Old Orchard Beach, Lewiston, AugustaExit 53 on I-95 / Turnpike
Gray16.74– 16.7726.94– 26.99US202 west/ SR4 south/ SR115/ SR26A north (Gray Road / Yarmouth Road) to I-95/ Maine TurnpikeWindhamSouthern end of US 202 / SR 4 concurrency; southern terminus of SR 26A
16.7927.02SR26 north (Shaker Road)– NorwayNorthern end of SR 26 concurrency
New Gloucester24.3639.20SR231 south (Intervale Road)/ Bald Hill Road– New GloucesterNorthern terminus of SR 231
AndroscogginAuburn27.0143.47SR122 west (Poland Spring Road)/ Moose Brook Road– PolandEastern terminus of SR 122
27.99– 28.1345.05– 45.27I-95/ Maine TurnpikePortland, Boston, Lewiston, AugustaExit 75 on I-95 / Turnpike
32.08– 32.1351.63– 51.71SR11 south/ SR121 west (Minot Avenue)– Minot, Mechanic FallsSouthern end of SR 11 concurrency; eastern terminus of SR 121; access from southbound US 202 / SR 4 only
32.7752.74SR4 north (Union Street)/ Court Street– FarmingtonNorthern end of SR 4 concurrency
33.0453.17SR136 south (Mechanics Row)/ Turner StreetNorthern terminus of SR 136 (southbound direction of SR 136)
33.1153.29SR136 (Main Street)/ Great Falls PlazaNorthern terminus of SR 136 (northbound direction of SR 136)
Lewiston33.45– 33.4753.83– 53.86SR196 south (Canal Street) to I-95/ Maine TurnpikeLisbon, BrunswickNorthern terminus of SR 196 (southbound direction of SR 136)
33.4953.90SR196 (Lisbon Street)/ Chapel Street AlleyNorthern terminus of SR 196 (northbound direction of SR 136)
33.67– 33.7054.19– 54.23SR126 east (Sabattus Street)– SabattusWestern terminus of SR 126
34.53– 34.6155.57– 55.70Russell Street - To SR196/ SR126Lisbon, AuburnInterchange
Leeds45.4573.14SR106 northSouthern terminus of SR 106
KennebecMonmouth49.5579.74SR132 south (Main Street)/ Blaisdell Road– MonmouthNorthern terminus of SR 132
Winthrop52.71– 52.9884.83– 85.26SR41/ SR133 north (Western Avenue)– Readfield, Downtown Winthrop, WayneInterchange; southern termini of SR 41 / SR 133
55.9690.06SR135 north (Stanley Road)– Readfield, Belgrade
56.0890.25SR135 south (Winthrop Center Road)– East Monmouth
Manchester59.3195.45SR17 west (Readfield Road)/ Pond Road– Readfield, LitchfieldSouthern end of SR 17 concurrency
Augusta61.89– 62.1499.60– 100.00I-95/ Maine Turnpike south– Portland, BangorNorthern terminus of Maine Turnpike; exit 109 on I-95 / Turnpike
63.62– 63.67102.39– 102.47US201 south/ SR8 north/ SR11 north/ SR27 (State Street)– Gardiner, BelgradeMemorial Circle; southern end of US 201 concurrency; northern end of SR 11 concurrency; southern terminus of SR 8
Kennebec River63.93– 64.30102.89– 103.48Memorial Bridge
KennebecAugusta64.35– 64.44103.56– 103.71SR9 west/ SR17 east (Stone Street)/ SR105 east to SR27 (Cony Street)– Downtown AugustaCony Circle; northern end of SR 17 concurrency; southern end of SR 9 concurrency; western terminus of SR 105
65.01– 65.03104.62– 104.66US202 east (North Belfast Avenue)/ SR9 east– ChinaNorthern end of US 202 / SR 9 concurrency
65.67– 65.69105.69– 105.72SR3 to I-95– Augusta Civic Center Drive, Portland, Belfast
Winslow80.87130.15SR137 (Carter Memorial Drive)– Oakland, China
81.81131.66SR137 Bus. east (China Road)– ChinaSouthern end of SR 137 Bus. concurrency
81.94131.87SR100A north (Halifax Street)– Clinton, BurnhamSouthern terminus of SR 100A
Waterville82.61– 82.67132.95– 133.04SR137 Bus. west (Spring Street) to Water Street south/ I-95OaklandNorthern end of SR 137 Bus. concurrency
83.06133.67SR11 south/ SR104 (Elm Street / Main Street)– Oakland, SidneySouthern end of SR 11 concurrency; intersection with SR 104 in southbound lanes only
SomersetFairfield86.10– 86.14138.56– 138.63US201 north/ SR139 west (Upper Main Street) to Lawrence Avenue/ I-95Northern end of US 201 concurrency; southern end of SR 139 concurrency
KennebecBenton88.25– 88.28142.02– 142.07SR100A south (Clinton Avenue)– WinslowNorthern terminus of SR 100A
88.33142.15SR139 east (Sebasticook Bridge Road)– Albion, UnityNorthern end of SR 139 concurrency
WaldoNo major junctions
SomersetPittsfield105.54169.85SR69 east (Hunnewell Avenue)– DetroitWestern terminus of SR 69
105.61169.96SR152 north (Somerset Avenue) to I-95HartlandSouthern terminus of SR 152
Palmyra109.59176.37SR220 south (Main Street)– DetroitNorthern terminus of SR 220
111.78– 112.07179.89– 180.36I-95Bangor, WatervilleExit 157 (I-95)
PenobscotNewport112.27– 112.37180.68– 180.84US2 west (Main Street)/ SR7 north/ SR11 north (Moosehead Trail)– Skowhegan, Sugarloaf, DexterRoundabout; southern end of US 2 / SR 7 concurrencies; northern end of SR 11 concurrency
115.86186.46SR7 south (Roussin Road) to Stetson Road/ I-95Dixmont, PlymouthNorthern end of SR 7 concurrency
Etna121.44195.44SR143 (Lakins Road / Dixmont Road)– Stetson, Dixmont
Carmel124.71200.70SR69 (Plymouth Road / Hampden Road) to I-95Winterport
Bangor137.19– 137.30220.79– 220.96I-395 east to I-95/ SR15/ Odlin Road– Newport, Orono, Bangor, BrewerWestern terminus and exits 1A-B on I-395; cloverleaf interchange
138.28– 138.43222.54– 222.78I-95/ SR15Newport, Augusta, Orono, HoultonExit 183 on I-95
139.62224.70SR222 west (Union Street)Eastern terminus of SR 222
139.93225.20US2 east (State Street)/ Central Street / Main Street
1.000mi = 1.609km; 1.000km = 0.621mi

Alternate route

State Route 100A (SR100A) is a 5.2-mile (8.4km) alternate route of SR100 running between the towns of Winslow and Benton.

Route 100A's alignment was formerly part of SR32, before SR32 was truncated in 1954 to end at SR137 Business, near its intersection with US201/SR100 just south of SR100A's current terminus. The old alignment, which connected to SR100 at both ends, was redesignated as SR100A (as a bypass of SR100's alignment in Winslow and Benton).

External links